A while ago , the Tumblr backlinking method when you reblogged, was a great way to get backlinks. No they have become nofollow and keep multiplying. I made maybe 100 and webmaster now says i have 9000. I realize that having too many backlinks from the same place can be bad and since they are now nofollow , i figure i can delete the account along with all the links . however, a large amount of backlinks being deleted can also be bad for ranking. Should i just delete them and take a one month punishment and start over?
Tumblr is still good to get a PR 5 backlink. Dofollow or not .. it's still a link and it also got a value.
Exactly do follow links are over rated. I don't even look to see if a site is a do follow/no follow anymore because it's good to have a good mixture of both do follow, and no follow backlinks for your site.
Google loves sites like tumblr. Doesn't matter if they are DoFollow or not. If they are not all the same content, it should be no problem